WKWebKit-ViewController.m

#import "ViewController.h"

static NSString * const adCountKey = @"adCountKey";
static NSString * const highScoreKey = @"highScoreKey";

@import WebKit;

@interface ViewController () <WKScriptMessageHandler>
    @property (strong, nonatomic) WKWebView *webView;

    @property (assign, nonatomic) NSInteger adCount;
    @property (assign, nonatomic) NSInteger highScore;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    
    //TODO: read adCount / highScore from UserDef

    self.adCount = [[NSUserDefaults standardUserDefaults] integerForKey:adCountKey];
    self.highScore = [[NSUserDefaults standardUserDefaults] integerForKey:highScoreKey];
    
    // First create a WKWebViewConfiguration object so we can add a controller
    // pointing back to this ViewController.
    WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];
    WKUserContentController *controller = [[WKUserContentController alloc] init];
    
    // Add a script handler for the "observe" call. This is added to every frame
    // in the document (window.webkit.messageHandlers.NAME).
    [controller addScriptMessageHandler:self name:@"observeHighScore"];
    [controller addScriptMessageHandler:self name:@"observeAd"];
    
//    [controller addScriptMessageHandler:self name:@"observeLocalStorage"];
    
    
    configuration.userContentController = controller;
    
    NSString *gamePath = [NSBundle.mainBundle pathForResource:@"index" ofType:@"html" inDirectory:@"RunColorGame"];
    
    // This is the URL to be loaded into the WKWebView.
    NSURL *gameUrl = [NSURL fileURLWithPath:gamePath];
    
    NSString *dir = [gamePath stringByDeletingLastPathComponent];
    
    NSURL *dirUrl = [NSURL fileURLWithPath:dir isDirectory:YES];
    // Initialize the WKWebView with the current frame and the configuration
    // setup above
    _webView = [[WKWebView alloc] initWithFrame:self.view.frame
                                  configuration:configuration];
    
    
    // Load the jsbin URL into the WKWebView and then add it as a sub-view.
    [self.view addSubview:_webView];
    
    NSError *error = nil;
    BOOL isReachable = [gameUrl checkResourceIsReachableAndReturnError:&error];
    
    if (isReachable) {
        [_webView loadFileURL:gameUrl
      allowingReadAccessToURL:dirUrl];
    }
}